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Basic and Diluted Earnings Per Share Basic and Diluted Earnings Per Share (Details Textual) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
May. 31, 2015 | May. 31, 2014 | Oct. 31, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Value | $ 182.4 | $ 249.7 |
Share Repurchase Program 1 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Shares |  | 6.2 |
Share Repurchase Program, Authorized Amount |  |  | $ 350.0
Stock Repurchased and Retired During Period, Value |  | $ 249.7 |
Share Repurchase Program 2 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Shares | 3.9 |  |
Share Repurchase Program, Authorized Amount |  | $ 350.0 |
Stock Repurchased and Retired During Period, Value | $ 182.4 |  |

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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